Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
Created attachment 501120[details][diff][review]
add getExtension call
We need a getExtension() call, which will currently just always return null, to pass the test suite and prepare for future extensions.